1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.servlet.filters.doubleclick;
24  
25  import com.liferay.portal.kernel.log.Log;
26  import com.liferay.portal.kernel.log.LogFactoryUtil;
27  import com.liferay.portal.kernel.util.HttpUtil;
28  import com.liferay.portal.servlet.filters.BasePortalFilter;
29  
30  import javax.servlet.FilterChain;
31  import javax.servlet.http.HttpServletRequest;
32  import javax.servlet.http.HttpServletResponse;
33  import javax.servlet.http.HttpSession;
34  
35  import org.apache.commons.lang.time.StopWatch;
36  
37  /**
38   * <a href="DoubleClickFilter.java.html"><b><i>View Source</i></b></a>
39   *
40   * @author Olaf Fricke
41   * @author Brian Wing Shun Chan
42   * @author Raymond Augé
43   */
44  public class DoubleClickFilter extends BasePortalFilter {
45  
46      protected void processFilter(
47              HttpServletRequest request, HttpServletResponse response,
48              FilterChain filterChain)
49          throws Exception {
50  
51          StopWatch stopWatch = null;
52  
53          if (_log.isDebugEnabled()) {
54              stopWatch = new StopWatch();
55  
56              stopWatch.start();
57          }
58  
59          HttpSession session = request.getSession(false);
60  
61          if (session == null) {
62              processFilter(
63                  DoubleClickFilter.class, request, response, filterChain);
64          }
65          else {
66              DoubleClickController controller = null;
67  
68              synchronized (session) {
69                  controller = (DoubleClickController)session.getAttribute(
70                      _CONTROLLER_KEY);
71  
72                  if (controller == null) {
73                      controller = new DoubleClickController();
74  
75                      session.setAttribute(_CONTROLLER_KEY, controller);
76                  }
77              }
78  
79              boolean ok = false;
80  
81              try {
82                  controller.control(request, response, filterChain);
83  
84                  ok = true;
85              }
86              finally {
87                  if (_log.isDebugEnabled()) {
88                      String completeURL = HttpUtil.getCompleteURL(request);
89  
90                      if (ok) {
91                          _log.debug(
92                              "Double click prevention succeded in " +
93                                  stopWatch.getTime() + " ms for " + completeURL);
94                      }
95                      else {
96                          _log.debug(
97                              "Double click prevention failed in " +
98                                  stopWatch.getTime() + " ms for " + completeURL);
99                      }
100                 }
101             }
102         }
103     }
104 
105     private static final String _CONTROLLER_KEY =
106         DoubleClickFilter.class.getName();
107 
108     private static Log _log = LogFactoryUtil.getLog(DoubleClickFilter.class);
109 
110 }